Laserfiche WebLink
<br />MW-11 to 2.3 mg/kg for sample MW-]0. The presence of TEPH vas not indicated above <br />tlrc laboratory dctcction limit of 1.0 mg/L in the remaining groundwater samples analyzed. <br />Analytical results for the groundwater samples indicate the presence of low concentrations <br />of benzene, toluene, ethylbenzene, and xylene in samples SH-1 and MW-1 ]. BTEX <br />constituents were not indicated at concentrations above the laboratory detection limit in the <br />remaining groundwater samples analyzed. A copy of the laboratory analytical report for the <br />seven groundwater samples is attached as Appendix C. Analytical results for the <br />groundwater samples arc summarized below in Table 3. <br />TABLE 3 <br />SUMMARY OF GROUNDWATER SAIVIPLE ANALYTICAL RESULTS <br />Sample TEPH Benzene Toluene Ethylbenzene Xylene <br />SH-1 2.0 0.0020 0.0025 0.004 0.032 <br />MW-10 2.3 0.0026 0.0067 0.0097 0.056 <br />MW-1l 2.0 <0.005 U <0.005 U <0.005 U <0.005 U <br />M W-12 < 1.0 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U <br />M W-13 < 1.0 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U <br />MW-14 < l.0 U <0.00~ U <0.005 U <0.005 U <0.005 U <br />MW-15 <1.0U <O.OO~U <O.OO~U <O.OO~U <O.OOSU <br />State MCL Nonc 0.005 1.0 0.680 ]0 <br />Notes: Rcponcd values in mg/L <br />U = analytc undctcc[cd <br />Drinking Wa[cr Maeimum Contaminant Level (tv1CL) <br />4.0 REGULATORYREPORTINGREQUIREttilENTS <br />As discussed above in Section 2.0, apparent diesel product was observed underneath the <br />tank firm liner and above the ground surface. Evidence of product release was also <br />observed on the concrete surfaces adjacent to the east of the tank farm. Although the <br />release visually appears to be greater than 2~ gallons, an estimated quantity of oil that may <br />have been released has not been determined. This determination will require additional <br />infornration (e.g., tank operating data), if available. <br />A shallow ground water table exists underneath the tank farm. ERM is currently reviewing <br />ground water quality data tom monitoring wells installed in the vicinity of the tank farm to <br />determine if ground water has been impacted to date. Based on the spill reporting <br />requirements described herein and the preliminary results of the subsurface investigation, <br />Southwestern Portland Cement Company may be required to notify the following agencies <br />(verbally and in writing) of the release(s). <br />edera! <br />Federal reporting obligations are set forth in Discharge of Oil Regulations (40 CFR 110.6 <br />and 110.10) and require that spills into or upon the "navigable" waters of the U.S. or <br />ERM-ROCt:Y AtOIMI'NN, INC. <br />P:\I000\S1YPC1961019V2EPORT.DOC Printed on Recycled Paper <br />7 <br />